python Documentation
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TypeScript extends JavaScript by adding types to the language. TypeScript speeds up your development experience by catching errors and providing fixes before you even run your code.
现代 JavaScript 教程：有关示例和任务的简单但详细的解释包括：闭包、文档和事件，以及面向对象编程等。
The MDN Web Docs site provides information about Open Web technologies including HTML, CSS, and APIs for both Web sites and progressive web apps.
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Codeforces. Programming competitions and contests, programming community
AtCoder is a programming contest site for anyone from beginners to experts. We hold weekly programming contests online.
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Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.
The official home of the Python Programming Language
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GitHub is where over 83 million developers shape the future of software, together. Contribute to the open source community, manage your Git repositories, review code like a pro, track bugs and features, power your CI/CD and DevOps workflows, and secure code before you commit it.
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识别图片中的公式！免费的在线LaTeX公式编辑器。支持导出svg、超大png、jpg、MathML、SVGCode。可以打出任何公式，不只是数学！支持物理physics、化学mhchem、unicode等常用扩展宏包加载。即时渲染，基于MathJax实现。
An online LaTeX editor that’s easy to use. No installation, real-time collaboration, version control, hundreds of LaTeX templates, and more.
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Online GDB is online compiler and debugger for C/C++. You can compile, run and debug code with gdb online. Using gcc/g++ as compiler and gdb as debugger. Currently C and C++ languages are supported.
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Javascript Obfuscator - Protects JavaScript code from stealing and shrinks size - 100% Free
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Interactive Open Source Numerical Library of C/C++ functions for Engineering, Finance, Maths, Science and Statistics. With Online Calculators for Numerical Components and Excel Add-ins.
GeoGebra - the world’s favorite, free math tools used by over 100 million students and teachers
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